Maya Ellison
Measuring a small plastic pipe is a simple task that can be done in a few steps. It is important to get the right measurements to avoid buying the wrong materials, which could lead to expensive repairs. The first step is to identify the type of pipe you are working with. Pipes are typically categorised into three types: male, female, and no-thread. Once you have identified the type of pipe, you can proceed to measure its diameter. This can be done using a tape measure or a caliper. If using a tape measure, wrap it around the outside of the pipe to get the circumference, then divide that measurement by pi to get the outer diameter. If using a caliper, simply fit it around the outside of the pipe to get the outer diameter directly. Finally, compare your measurements with a pipe sizing chart to determine the exact size of the pipe.
| Characteristics | Values |
|---|---|
| What to measure | Outside diameter (OD) of the pipe |
| Tools | Tape measure, string, caliper |
| Formula | Circumference/pi (3.1415) = outside diameter |
| Pipe sizing charts | Metric system (millimetres), inch/imperial system (inches) |
| Pipe types | Male, female, no-thread |
| Pipe materials | Copper, iron, steel, plastic |
| Pipe wall thickness | Schedule 40, Schedule 80 |
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What You'll Learn
Use a tape measure across the pipe's width
Measuring a small plastic pipe is a simple task that can be done in a few steps. If you are using a tape measure across the pipe's width, here are some detailed steps to follow:
Firstly, it is important to understand that all plastic pipes are measured based on their outside diameter, which is the width across the outside of the pipe. This is because the pipe needs to fit into a socket, and the outside diameter remains the same even if the pipe wall changes. Therefore, you should measure from outside edge to outside edge across the pipe.
Next, take your flexible tape measure and wrap it around the pipe's circumference. If you don't have a flexible tape measure, you can use a piece of string instead. Wrap the string around the pipe and mark the point where it meets the start of the string. Then, measure the length of the string with a ruler or a tape measure.
Finally, to get the outside diameter, divide the circumference measurement by pi (approximately 3.14159). For example, if the circumference is 12.57 inches (or 319 mm), dividing by pi gives you an outside diameter of about 4 inches (or 100 mm).
This method of measuring the pipe's width with a tape measure is straightforward and does not require specialised tools. It is a handy skill to have, especially for DIY projects or plumbing work.
Remember, the actual outside diameter of the pipe will be larger than its nominal pipe size, so be sure to convert your measurement to the nominal size if needed.
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Measure the outer diameter with a caliper
Measuring the outer diameter of a small plastic pipe with a caliper is a straightforward process. Calipers are versatile tools that can be used to measure the outer diameter of round objects, such as pipes. Before using the caliper, ensure that you zero it out by sliding the clamps closed and pushing the extension rod in completely. This step is crucial for ensuring accurate measurements.
To measure the outer diameter of the pipe, open the caliper's jaws wider than the pipe's outside diameter. Then, close the jaws around the outside of the pipe. The caliper's outer jaws, located on the bottom of the measurement portion, are specifically designed for external measurements. Ensure that the caliper is closed snugly around the pipe without applying excessive force, especially if the pipe is made of a soft material.
After taking the measurement with the caliper, record the value. This direct measurement of the outer diameter is more straightforward than alternative methods, such as measuring the circumference and then calculating the diameter. By using a caliper, you avoid the need for additional calculations or conversions.
It's important to note that all plastic pipes are measured based on their outer diameter rather than the inner diameter. This standardisation ensures that the pipe can fit snugly into a socket, regardless of the pipe wall thickness. Therefore, when measuring a small plastic pipe, focusing on the outer diameter with a caliper is a precise and efficient approach.
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Use a piece of string to measure the circumference
Measuring a small plastic pipe can be a little confusing, but it's a useful skill to have for plumbing and building projects. To measure the circumference of a small plastic pipe using a piece of string, follow these steps:
Firstly, wrap the string around the pipe, ensuring that it is level and aligned with the outer edge of the pipe. Mark the point on the string where it completes a full wrap around the pipe. It is important to ensure that the string is wrapped tightly and snugly around the pipe, without any slack or gaps. This will ensure an accurate measurement.
Next, remove the string from the pipe and lay it flat on a surface. Take a ruler or a tape measure and measure the length of the string from the start to the marked endpoint. This will give you the circumference of the pipe. Ensure that you are using a straight ruler or a flexible tape measure for this step, as an inaccurate measuring tool will compromise the precision of your results.
Now, to find the outer diameter of the pipe, take the circumference measurement and divide it by pi, which is approximately 3.14159. For example, if the circumference of the pipe is 12.57 inches (or 319 mm), dividing this by pi yields an outer diameter of about 4 inches (or 100 mm). This method works for pipes with male threads or no threads.
Finally, if you need to determine the nominal pipe size, which is the size you would buy in a store, you may need to convert the outer diameter. If your pipe is smaller than 14 inches (360 mm), you will need to convert the outer diameter to the nominal size. This is because the nominal pipe size is a standardised designation and does not correspond to the actual physical measurements of the pipe.
Measuring a small plastic pipe using a piece of string is a simple and effective method. It is important to ensure accuracy at each step to achieve reliable results.
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Convert your diameter to nominal size if it's under 14 inches
If you're measuring a small plastic pipe, you'll need to measure the outer diameter of the pipe with a caliper or a soft tape measure. Then, you can compare this measurement to a pipe sizing chart to find the exact size.
If your pipe has a diameter of under 14 inches (360 mm), you'll need to convert your diameter to nominal size. Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes, and the metric equivalent is called DN (Diameter Nominal). If you're in North America, convert your diameter to Nominal Pipe Size (NPS). NPS is defined by the American standard ANSI/ASME and is based on inches, with values often expressed as fractions or decimals (e.g. 1/2", 2.5"). If you're using the metric system, convert your diameter to Diameter Nominal (DN), which is defined by the European standard ISO 6708 and is based on millimetres.
If you're measuring the pipe's circumference with a soft tape measure, you'll need to divide your measurement by pi to get the outside diameter. Then, use a conversion chart to get the nominal pipe size. This is the size you'd typically buy in a store.
It's important to note that tubing is named based on its outside diameter, so you don't need to convert it to nominal diameter. Additionally, if your pipe has a heavy pressure rating and a thick wall, the outside diameter will remain the same, while the inside diameter will get smaller as the wall changes.
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Refer to a pipe sizing chart
When measuring a small plastic pipe, it is important to refer to a pipe sizing chart. These charts can be found online and will help you to understand the measurements of your pipe. The charts will also help you to find out the "schedule" of your pipe, which relates to the wall thickness.
There are two main systems for measuring pipe sizes: the metric system and the inch/imperial system. The metric system is used in Europe and many other parts of the world, including the UK, and labels pipe diameters in millimetres. The inch/imperial system is used in North America, Asia, and the UK, and labels pipe diameters in inches. It is important to note that the inch/imperial system is based on the approximate bore of the inside of the pipe, but it is more effective to think of this size as the name of the pipe rather than a measurement. For example, a two-inch pipe does not measure two inches in outside diameter but rather 60.3mm. On the other hand, in the metric system, the outside diameter of the pipe is the same as the name of the pipe. So, a 63mm pipe has a 63mm outside diameter.
When referring to a pipe sizing chart, you will need to know the type of pipe you are working with. There are three types of pipes: male, female, and no-thread pipes. Male pipes have grooves on the outside or are thinner than the female end they fit into. Female pipes have grooves on the inside or have an inside diameter the same as the male pipe's outside diameter. No-thread pipes are smooth on both ends with no grooves.
You can use a tape measure or a caliper to measure the outside diameter of your pipe. Then, compare this measurement to a pipe sizing chart to determine the exact size of your pipe. This will ensure that you are buying the correct materials for your project and avoid any costly mistakes.
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Frequently asked questions
Small plastic pipes can be measured using a tape measure or a piece of string. Measure the outer diameter of the pipe, then check online for a pipe sizing chart to compare your measurement.
The metric system labels pipe diameters in millimetres, while the inch/imperial system labels diameters in inches. The metric system is used in Europe and other parts of the world, while the inch/imperial system is used in North America, Asia, and the UK.
Nominal pipe size is the size you would buy in the store. It is the size written on the side of the pipe. For example, a 2" pipe is just the nominal pipe size, and does not measure 2" exactly in diameter.
Outer diameter is the width of the outside of the pipe. To find the nominal pipe size, you need to reference an ASME chart with the OD measurement.
You can use a tape measure, a piece of string, or a caliper. Calipers are especially useful for accurate readings on smaller pipes.
